NZ755981A - Cannula - Google Patents
CannulaInfo
- Publication number
- NZ755981A NZ755981A NZ755981A NZ75598119A NZ755981A NZ 755981 A NZ755981 A NZ 755981A NZ 755981 A NZ755981 A NZ 755981A NZ 75598119 A NZ75598119 A NZ 75598119A NZ 755981 A NZ755981 A NZ 755981A
- Authority
- NZ
- New Zealand
- Prior art keywords
- cannula
- clip
- body part
- contact
- control
- Prior art date
Links
- 230000000638 stimulation Effects 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 239000004033 plastic Substances 0.000 claims description 10
- 229920003023 plastic Polymers 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 2
- 230000036633 rest Effects 0.000 claims description 2
- 230000023298 conjugation with cellular fusion Effects 0.000 description 10
- 230000013011 mating Effects 0.000 description 10
- 230000021037 unidirectional conjugation Effects 0.000 description 10
- 238000003780 insertion Methods 0.000 description 7
- 238000002604 ultrasonography Methods 0.000 description 7
- 241001631457 Cannula Species 0.000 description 5
- 239000003589 local anesthetic agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 206010002091 Anaesthesia Diseases 0.000 description 3
- 230000037005 anaesthesia Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000875 corresponding Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 210000000578 Peripheral Nerves Anatomy 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral Effects 0.000 description 1
- 230000001105 regulatory Effects 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Abstract
The present invention relates to a cannula (1), comprising a cannula body with a cannula tube (11) and a body part (10) attached to the proximal end of the cannula tube (11), a control clip (30) having a mounting body (31) with at least one control element (35, 36), said control clip (30) being attachable laterally on the body part to form a first configuration (I). In addition, the present invention relates to a cannula body, a contact clip (20) and a control clip (30) of a cannula (1) according to the invention. Figure 3 chable laterally on the body part to form a first configuration (I). In addition, the present invention relates to a cannula body, a contact clip (20) and a control clip (30) of a cannula (1) according to the invention. Figure 3
Description
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Cannula
The present invention relates to a cannula with the features of
claim 1 and a cannula body having the features of claim 19, a
control clip having the features of claim 20 and a contact clip
having the features of claim 21.
Cannulas in different configurations are well-known in the prior
art. Cannulas typically comprise a cannula tube made of an
electrically conductive material, preferably metal, with a body
part disposed at the proximal end thereof and a cannula tip
disposed at the distal end thereof. By means of the body part,
the cannula tip can be fed transcutaneously to a nerve of a
patient by medical personnel for treatment purposes, wherein the
position of the cannula tip can be determined, inter alia, by
electrical stimulation impulses. The electrical stimulation
impulses are supplied via a stimulation cable which contacts the
electrically conducting cannula tube in the region of a proximal
body part of the cannula. Such cannulas are known, for example,
from US Pat. No. 7,022,115 B1, EP 1 002 500 A1 and DE 10 2016
110 379 A1 and are used in particular in anesthesia for
peripheral nerve block.
In therapy or in anesthesia, ultrasound is used more and more to
observe and check the exact position of the cannula tip and the
cannula tube, respectively, in the patient to be treated. For
this purpose, an ultrasound probe emitting ultrasonic signals
and receiving the ultrasonic signals reflected by the metallic
cannula tube is placed on the body surface of the patient. As a
result of the improved ultrasound visibility of the cannula, as
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described, for example, in 024 A1, the anesthetists
are increasingly limited to the ultrasonic location of the
cannula tube and dispense with the electrical stimulation.
It has proven disadvantageous that the medical personnel on the
one hand must hold the ultrasound probe for checking and
observing the position of the cannula tube and, in addition, on
the one hand control the supply and aspiration of a liquid
through the cannula, in particular a local anesthetic, by
suitable control elements, and on the other hand must set the
electrical stimulation impulses. In the cannulas known from the
prior art, the operation has proven to be cumbersome and
required increased staffing of medical personnel in the
treatment of the patient.
This is the starting point of the present invention.
It is the object of the invention to provide an improved
cannula, which expediently eliminates the disadvantages known
from the prior art cannulas and conveniently combines a
simplified operation by medical personnel as well as cost
advantages in the production and reuse of individual components.
In particular, the handling of the improved cannula and the
ultrasound probe for observing and checking the position of the
cannula tube should be possible by a single person, wherein all
functions of the cannula, that is to say controlling the supply
of liquids and/or the removal of liquids or injecting and/or
aspirating and providing stimulation impulses as well as the
guiding of the cannula or the positioning of the distal end of
the cannula tube at the nerve, can be done in a single
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operation. Combining stimulation and ultrasound aims at enabling
more safety for patients and medical personnel. The pictorial
sonographic representation of the individual anatomy of the
patient and the simultaneous control of the spacing of the
cannula and the nerve by means of stimulation not only allow an
optimization of the puncture accuracy and thus an optimal effect
and optimal use of the local anesthetic in terms of the amount
used when injecting the local anesthetic, but, as a technique,
provide also a proven time advantage in the treatment.
According to the invention, these objects are achieved by a
cannula with the features of claim 1. In addition, according to
the invention, these objects are achieved by a cannula body with
the features of claim 19, a control clip with the features of
claim 20, and a contact clip with the features of claim 21.
The dependent claims contain further advantageous embodiments of
the invention.
The essential idea of the invention is based on forming a
cannula in the manner of a modular system in several parts,
whereby this cannula, depending on the intended application, can
be equipped in a first configuration with a control clip, or in
a second configuration, additionally with a contact clip for
electrical stimulation.
The cannula with the features of claim 1 comprises a cannula
body having a cannula tube and a body part attached to a
proximal end of the cannula tube, and a control clip, having a
mounting body with at least one electrical control element, said
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mounting body being laterally attachable to the body part to
form a first configuration.
In a second configuration, according to an advantageous
development of the present invention, the cannula according to
the invention can be provided with contact clip which is
arranged ergonomically laterally on the body part. The contact
clip comprises a mounting part with at least one electrical
contact, wherein the contact clip is laterally attachable to the
body part to form the second configuration, and the electrical
contact in the second configuration establishes an electrical
connection between a stimulation cable and an electrically
conductive wire of the cannula tube in the region of the body
part. In the second configuration, the cannula according to the
invention can be used for electrical stimulation in the manner
of a conventional technique known from the prior art, wherein,
preferably, the at least one control element of the contact clip
can be used to control the electrical stimulation impulses in
the second configuration. After use of the cannula according to
the invention, the contact clip can be removed from the body
part and used for the treatment of other patients after
appropriate cleaning.
According to a further advantageous embodiment of the present
invention, the mounting part of the contact clip has at least
one pair of resilient latching arms which engage the body part.
The mounting of the contact clip is thus effected by means of a
latching connection, wherein the contact clip is attached
laterally on the body part and the resilient latching arms each
have at least one latching lug which engages a corresponding
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latching recess in the body part and/or engages behind a
corresponding edge of the body part. When the contact clip is
transferred to the body part for forming the second
configuration, the latching arms rest diametrically to one
another on both sides of the body part, the recess being in the
region of the body part between the latching arms for engaging
the electrical contact of the contact clip. Alternatively, the
contact clip or the mounting part of the contact clip can be
adapted to be pivotally mounted on the body part and locked at
the body part by the resilient latching arms.
An advantageous development of the present invention provides
that, in the second configuration, the electrical contact
engages a recess of the body part and electrically contacts the
cannula tube. Thus, if the contact clip is attached to the body
part by the mounting part for forming the second configuration
the electrical contact engages the recess of the body part. The
recess of the body part does not cover the metallic cannula tube
or the electrically conducting wire of the non-electrically
conductive cannula tube and allows an electrical connection
between the electrical contact and the metallic cannula tube or
the electrically conductive wire of the cannula tube.
Accordingly, in the mounting part of the contact clip, the
electrical contact is disposed on the body part-facing side,
which does not affect the outer design of the body part, and the
handling of the cannula according to the invention is
unobstructed and fully consistent with a conventional cannula
known in the prior art.
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It has proven advantageous if the electrical contact for
electrically contacting the cannula tube is designed as an
insulation displacement contact which is pressed onto the
cannula tube during the transfer of the contact clip into the
second configuration. The insulation displacement contact
effects a reliable electrical contact with the cannula tube and
ensures that no insulating layer on the cannula tube adversely
affects the transmission of the electrical stimulation impulses
from the electrical contact to the cannula tube or the
electrically conducting wire of the cannula tube.
In addition, according to a further advantageous embodiment of
the present invention, the electrical contact is provided with a
spring tab which is adapted to protrude into the recess of the
body part and to rest on the cannula tube to form an electrical
connection. In particular, it has proven advantageous if the
free end of the spring tab is formed with sharp edges, whereby a
secure electrical connection is effected when the spring tab
rests on the cannula tube.
A further advantageous embodiment of the present invention
provides that the contact clip has a connector which can
establish an electrically detachable connection to the
stimulation cable. In particular, in this case, it has proven
advantageous if the electrical contact has a further spring tab
at a second end, which provides a clamping contact to form the
electrical connector. As a result, a particularly compact
connector is provided, which meets the requirements of a space-
saving design. In this case it is particularly preferred that
the connector is centrally located between the pairwise arranged
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latching arms and more preferably is held positively in the
first and/or second configuration by retaining bars molded or
joint at the body part.
According to a further advantageous embodiment of the present
invention, the at least one control element is an electrical
control element. More preferably, the control element is
connected to a control line, wherein the control line can be
coupled to a device, which generates the electrical stimulation
impulses which are transmitted to the electrically conducting
wire of the cannula tube by means of the stimulation cable and
the contact clip. In addition, more preferably, the control line
can be electrically connected to the device or to a further
device which is adapted to supply or aspirate a liquid which is
to be injected or aspirated through the cannula tube.
Accordingly, the at least one control element of the control
clips is adapted to control an electrical current flowing in the
stimulation cable which electrical current represents the
stimulation impulses, in particular turning on and turning off.
In addition, the at least one control element can be designed to
control the stimulation impulses, in particular amplitude and
frequency.
It is advantageous if the control clip has at least one second
electrical control element, by means of which, for example, the
liquid which is passed through the cannula tube and injected
into the patient can be controlled. In particular, it is
advantageous if the injection and/or the aspiration of the
liquid can be switched on and off by the at least one second
electrical control element. Furthermore, it may be advantageous,
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if the at least one second control element is adapted to have an
effect on the injection - or aspiration rate, that is to say the
amount of injected or aspirated liquid per unit time.
It is furthermore advantageous if the at least two latching arms
of the mounting body of the control clip for mounting purposes
laterally on the body part embrace the body part and/or the
contact clip, and preferably establish a latching connection
with the contact clip and/or the body part of the cannula. In
this case, it is particularly advantageous if the at least two
latching arms of the mounting body of the control clip are
arranged diametrically spaced apart from one another and embrace
the control clip and/or the body part. More preferably, in the
first configuration, the contact clip is already located at the
body part or in the region of the control clip between the at
least two latching arms. This design measure for mounting the
control clip affects the outer design of the body part or the
cannula only slightly, making the handling of the cannula
according to the invention unobstructed and can be done in
particular in one hand grip position with one hand. In
particular, it is preferred if the at least two resilient
latching arms of the control clip embrace the mounting part of
the contact clip and the plug-in direction of the contact clip
and the control clips is the same. Alternatively, the contact
clip and the control clip may have different plug-in directions,
wherein the plug-in directions are particularly preferably
aligned rotated by 90°, 180° or 270° to one other around the
cannula tube.
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It is advantageous if the body part has a proximal connection,
on which the liquid to be injected can be applied coaxially to
the cannula tube. In particular, it is preferred that the
connection is formed with an injection hose inserted in the body
part. The injection hose is preferably fixedly disposed on the
body part and is thus held without the risk of being lost.
Through the connection, the liquid, in particular a local
anesthetic can be introduced into the cannula tube to apply this
liquid through the outlet opening at the cannula tip. The
connection can be designed, for example, as a connector, in
particular as a Luer-lock connector or as a NRfit connector.
This connector may be formed directly on the body part or
alternatively on the injection hose which is coaxially and
sealingly attached to or in the body part.
According to a further advantageous embodiment of the present
invention, the at least one control element is embedded in the
mounting body, whereby the at least one control element is fully
hermetically protected in the fixing body against external
influences, in particular liquids or contaminants. In
particular, in doing so, a reuse of the control clip after an
appropriate cleaning is possible.
Furthermore, it is particularly advantageous if the control
element in the second configuration can be operated from the
side facing away from the body part, which results in a
particularly ergonomic handling of the cannula according to the
invention.
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Also, it has proven advantageous if the mounting body has at
least one deformable region, in particular at least one
elastically deformable region, and that the at least one
deformable region allows the at least one control element
embedded in the mounting body to be operated. The operating
movement of the medical personnel is transferred through the
deformable region to the at least one control element, whereby
this control element either generates a corresponding electrical
switching signal or injection or aspiration is initiated
mechanically.
In addition, according to an advantageous embodiment of the
present invention, the mounting body is made of at least one
second electrically insulating plastic, which has a good
deformability. Preferably, at least the at least one deformable
region is made with the second electrically insulating plastic
on the side facing away from the body part, whereby the
electrical control element is particularly easy to operate. In
particular, silicone-containing plastics have proven useful as
the material for the second electrically insulating plastic.
It is advantageous if the control element can generate a
haptically and/or optically and/or acoustically perceptible
feedback. In particular, it is advantageous if the control
element for generating a haptically and acoustically perceptible
feedback has a snap dome and/or the control clip generates one
or more visually perceptible signals, such as by lighting means,
in particular LEDs.
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Moreover, it is advantageous if the at least one control element
is an electrically capacitive switch and/or an electrically
inductive switch. Such switches are inexpensive and safe to use.
According to a further advantageous embodiment of the present
invention, the body part and/or the mounting part of the contact
clip and/or the mounting body of the control clip is/are made of
an electrically insulating plastic. In particular, it is
advantageous if the body part, the mounting part and the
mounting body are made in at least one one-component injection
molding process.
Moreover, the present invention relates to a cannula body, a
contact clip and a control clip of a cannula according to the
invention. Thus, according to the invention, a cannula system is
proposed which, in a first configuration, realizes an improved
and simplified operation by means of a control clip attached
laterally to the body part and, in a second configuration,
enables stimulation by electrical currents.
Hereinafter, with reference to the accompanying drawings, an
exemplary and inventive embodiment will be explained in detail.
Figure 1 shows an exploded perspective view of the cannula
according to the invention, having a cannula tube with
a body part attached at the proximal end of the
cannula tube, a contact clip and a control clip,
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Figure 2 shows a perspective view of the cannula according to
Figure 1, wherein the contact clip is attached to the
body part,
Figure 3 shows a perspective view of the cannula according to
Figure 1 or 2, wherein said control clip is attached
to the body part to form a first configuration,
Figure 4 shows a sectional view along a longitudinal axis
through the cannula according to Figure 3,
Figure 5 shows a sectional view of the cannula tube with the
body part attached to the proximal end,
Figure 6 shows a sectional view of the contact clip, and
Figure 7 shows a sectional view of the control clip.
Figures 1 to 7 show an exemplary embodiment of a cannula 1
according to the invention.
Cannula 1 comprises a cannula body with a cannula tube 11
extending coaxially along a longitudinal axis. Cannula tube 11
may be made of an electrically insulating material and may
further have an electrically conductive wire. Alternatively,
cannula tube 11 can be made of a metallic material and be coated
on its outer circumference with an electrically insulating
plastic.
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Cannula tube 11 has a distal end and a proximal end, wherein a
cannula tip (not shown) is formed at the distal end, which is
adapted to be inserted in a patient's body for treatment
purposes. At the proximal end of cannula tube 11, a body part 10
is arranged, which is preferably injection molded from an
electrically insulating plastic material on cannula tube 11. The
body part 10 has substantially the usual shape of a rectangular
cuboid whose proximal and distal ends are widened in a flanged
manner to allow a secure gripping and guiding of the cannula by
medical personnel. An insertion recess 15 is formed between the
flange at the distal end and the flange at the proximal end.
A connection 18 is arranged at the proximal end of body part 10.
The connection 18 connects cannula tube 11 with injection hose
19 - as can be seen in detail in Figure 5. For this purpose,
injection hose 19 is pushed over the proximal end, which
protrudes from body part 10, and is attached or mounted fixedly
and sealingly to body part 10.
Injection hose 19 is used for supplying and/or discharging a
liquid, in particular a local anesthetic, which can be passed
through cannula tube 11 to the cannula tip at the distal end and
which can exit at the distal end of cannula 1. The injection
hose may have a connection to its free end (not shown), e. g., a
Luer lock connector or NRFit connector, to which a syringe or
the like can be connected for supplying the liquid.
Alternatively, the connector can also be formed directly on body
part 10 or at connection 18 if no injection hose 19 is desired.
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As shown in Figures 1 and 5, body part 10 has a recess 14 in the
region of insertion recess 15 between the distal flange and the
proximal flange, which is open on the upper face, as shown in
the drawing, of body part 10, and the depth of which extends at
least to cannula tube 11. In the illustrated exemplary
embodiment, recess 14 is open diametrically continuous through
the body part 10.
Cannula tube 11 may be formed of plain metal in the region
within recess 14, whereby metallic cannula tube 11 in this
section has no insulating peripheral coating.
In addition, two cams projecting from cannula tube 11 are formed
in the insertion recess 15, which are formed on the one hand
spaced apart from the distal flange and recess 14, and on the
other hand spaced apart from the proximal flange.
At the proximal end of body part 10 a notch 16 is incorporated
in the proximal flange and which extends from insertion recess
15 to the proximal end continuously through the proximal flange
and parallel to cannula tube 11.
In addition, cannula 1 comprises a contact clip 20 and a control
clip 30, which is shown for example in Figure 1 in a perspective
view and in Figure 6 in a sectional view.
Contact clip 20 comprises a mounting part 21 which is formed
substantially in the form of a rectangular cuboid and in which a
recess is formed or incorporated, which extends over the entire
longitudinal extension from a proximal end to a distal end and
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forms two diametrically opposed latching arms 22. Accordingly,
contact clip 20 is U-shaped in cross-section. Between the two
pairwise arranged latching arms 22, an electrical contact 25 is
arranged in recess of mounting part 21. Electrical contact 25
protrudes in the direction of the distal end of contact clip 20
into the recess between the two latching arms 22, wherein the
free distal end of the electrical contact which projects into
the recess, is formed as a spring tab 26 and can be deflected
resiliently parallel to the two latching arms 22.
Furthermore, it can be seen in particular in Figure 5 that the
end of the electrical contact 25 facing the proximal end may
also be formed as a spring tab 26 and projects in a freestanding
manner in a region, which is designed as a connector 27. The
free end of a mating connector 28 can be inserted into connector
27 to establish an electrical connection between a stimulation
cable 29 and electrical contact 25. Mating connector 28 is held
in connector 27, the spring tab 26 bearing against a mating
electrical contact of mating connector 28 and contributes to the
holding of mating connector 28 in connector 27 without the risk
of being lost. The shape of connector 27 corresponds to the
shape of the mating connector, wherein preferably the side of
connector 27 facing body part 10 is open and is partially closed
by electrical contact 25. Alternatively, stimulation cable 29
can also be attached directly to electrical contact 25.
At the respective free ends of latching arms 22 of mounting part
21 latching lugs 23 which are directed towards each other are
formed on latching arms 22 which protrude into the recess.
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In order to improve the handling of cannula 1, a control clip 30
can be plugged or clipped onto body part 10, thus forming a
first configuration I. In the illustrated exemplary embodiment,
however, it is provided that control clip 30 embraces contact
clip 20 and body part 10 to form the first configuration I,
contact clip 20 not being absolutely necessary for the
realization of the first configuration I. In this case, control
clip 30 is attached directly to body part 10.
Control clip 30 comprises a mounting body 31 and at least one
control element 35, 36. In the illustrated exemplary embodiment
control clip 30 comprises two electrical control elements 35,
36, however, the control elements may also be formed
mechanically, for example as valves for controlling aspiration
and application.
The first control element 35 and the second control element 36
can be operated independently of one another by the medical
personnel, wherein the first control element 35 can be used for
aspiration and the second control element 36 can be used for
regulating or controlling the liquid to be injected. In
addition, the first control element 35 and/or the second control
element 36 can be used to control the electrical stimulation
impulses.
In addition, control clip 30 may comprise a control line 39
which can be either detachably attached to control clip 30 by a
plug connection, or is fixedly connected to control clip 30 and
establishes an electrical connection to a unit, not shown, which
effects, for example, aspiration or injection or generates the
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electrical stimulation impulses, which are passed through
stimulation cable 29 to cannula tube 11 by means of electrical
contact 25.
Control clip 30 has approximately the usual shape of a
rectangular cuboid in which a recess extending from a proximal
end to a distal end is incorporated or molded, whereby control
clip 30 is U-shaped in cross-section. Through the recess, two
diametrically aligned latching arms 32 are formed, at the free
ends of which a plurality of latching lugs 33 are molded or
joint, which, directed towards each other, project into the
recess.
In mounting body 31, control elements 35, 36 are recessed, which
means that control elements 35, 36 are hermetically surrounded
by mounting body 31, which ensures that no liquids or
contaminants can come into contact with control elements 35, 36.
In Figures 1, 4, 6, control elements 35, 36 are arranged on the
side of mounting body 31 facing away from cannula tube 11, and
thus can be operated during the procedure with cannula 1
according to the invention by the medical personnel with a first
hand in one and the same hand-hold position while the same
medical personnel holds the ultrasound probe with the second
hand and observes and checks the position of the cannula during
treatment, for example, anesthesia. Due to the easy handling of
cannula 1, the medical personnel can devote full attention to
this task.
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In order to enable a simple and powerless operation of the
control elements 35, 36, mounting body 31 is thin-walled in a
region on the side facing away from cannula tube 11, whereby a
mechanical operation by the medical personnel is transferred to
control elements 35, 36 by a deformation of mounting body 31. In
particular, it is preferred if the deformable region is made of
a softer plastic, in particular silicone, whereby the mechanical
resistance during operation is reduced and the handling is
improved. It is particularly preferred to produce mounting body
31 in a two-component injection molding process.
In order for the medical personnel to devote full attention to
the positioning of cannula tube 11 at the site of use, for
example a nerve of the patient, when using cannula 1 according
to the invention, an advantageous development of the invention
provides that control elements 35, 36 upon operation generate a
haptic, acoustic or visual feedback, wherein advantageously the
haptic and acoustic feedback can be generated by a snap dome in
the respective control element 35, 36.
If cannula 1 is to be used for the electrical stimulation,
contact clip 20 can be attached to or clipped on body part 10,
and contact clip 20 and the cannula body with body part 10 and
cannula tube 11 together form the second configuration II.
Contact clip 20 is attached in a plug-in direction perpendicular
to cannula tube 11 on the body part.
The second configuration II is shown in perspective in Figure 2
and it can be seen that in the second configuration I, contact
clip 20 is inserted laterally in the plug-in direction in
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insertion recess 15 and the two latching arms 22 embrace body
part 10 between the distal flange and the proximal flange,
wherein latching lugs 23 engage body part 10 or an edge 17 on
the side of body part 10 facing away from contact clip 20
partially from behind to form a positive snap or clip
connection.
In the second configuration II, spring tab 26 of electrical
contact 25 protrudes into recess 14 of body part 10 between the
distal flange and the proximal flange and presses against
cannula tube 11 with its spring tab 26 which is formed at the
free end, whereby an electrical connection between electrical
contact 25 and cannula tube 11 is accomplished.
Furthermore, the two cams arranged in insertion recess 15 press
against electrical contact 25. Thereby, an additional clamping
force on the second spring tab 26 at the proximal end of the
contact clip 20 can be achieved, whereby the mating connector 28
is braced with connector 27 and detaching the electrical
connection between stimulation cable 29 and electrical contact
is prevented. The proximal end of contact clip 20 is
completely immersed in notch 16 at body part 10. In addition,
two retaining bars 13 are formed in notch 16, which protrude
from body part 10 into notch 16 and partially engage a bar at
mating connector 28 and fix the mating connector in notch 16.
To transfer cannula 1 in first configuration I, control clip 30
is placed in the plug-in directions in the illustrated exemplary
embodiment via second configuration I, or body part 10 and
contact clip 20, wherein the two latching arms 32 embrace
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contact clip 20 diametrically and latching lugs 33 arranged on
the free end of latching arms 32 are form-fitted with contact
clip 20 by partially embracing contact clip 20 and the free end
of latching arms 22 of contact clip 20, respectively. The
position of control clip 30 between the distal flange and the
proximal flange of body part 10 is fixed by the interaction of a
depression 24 at the distal end of contact clip 20 and a
protrusion 34 at the distal end of control clip 30 as well as at
the distal flange on body part 10, which in the assembled state
interlock in the first configuration I.
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List of reference numerals
1 cannula
body part
11 cannula tube
13 retaining bar
14 recess
Insertion recess
16 notch
17 edge
18 connection
19 injection hose
contact clip
21 mounting part
22 latching arm
23 latching lug
24 depression
contact
26 spring tab
27 connector
28 mating connector
29 stimulation cables
control clip
31 mounting body
32 latching arm
33 latching lug
34 protrusion
control element
36 control element
39 control line
PAJ130
Claims (21)
1. A cannula (1), comprising: - a cannula body having a cannula tube (11) and a body part 5 (10) attached to the proximal end of the cannula tube (11), - a control clip (30) having a mounting body (31) with at least one control element (35, 36), - said control clip (30) being attachable laterally to the body part to form a first configuration (I).
2. The cannula (1) according to claim 1, characterized in that a contact clip (20) is provided, and in that the contact clip (20) has at least one mounting part (21) with at least one 15 electrical contact (25), and in that the contact clip (20) is attachable to the side of the body part (10) to form a second configuration (II) and in that the electrical contact (25) in the second configuration (II) establishes an electrical connection between a stimulation lead (29) and an electrically 20 conductive wire of the cannula tube (11) in the region of the body part (10).
3. The cannula (1) according to claim 2, characterized in that 25 the mounting part (21) of the contact clip (20) has at least one pair of resilient latching arms (22) embracing the body part (10) for establishing a latching connection in the second configuration (II). 30
4. The cannula (1) according to claim 2 or 3, PAJ130 characterized in that the electrical contact engages a recess (14) of the body part (10) and electrically contacts the cannula tube (11) in the second configuration (II).
5. The cannula (1) according to any one of claims 2 to 4, characterized in that the electrical contact (25) has an insulation displacement contact that is pressed onto the cannula tube (11).
6. The cannula (1) according to any one of claims 2 to 5, characterized in that the electrical contact (25) has a spring tab (26) which rests on the cannula tube (11) in the recess (14) of the body part (10).
7. The cannula (1) according to any one of claims 2 to 6, characterized in that the contact clip (20) has a connector (27) that can establish an electrically detachable connection to the stimulation cable 20 (29).
8. The cannula (1) according to any one of claims 2 to 7, characterized in that the electrical contact (25) has a spring tab (26) for forming a 25 clamping contact with the electrical connector.
9. The cannula (1) according to any one of the preceding claims, characterized in that PAJ130 the at least one control element (35, 36) is an electrical control element and connected with a control line (39).
10. The cannula (1) according to any one of the preceding 5 claims, characterized in that the control clip (30) comprises at least two control elements (35, 36). 10
11. The cannula (1) according to any one of the preceding claims, characterized in that the mounting body (31) of the control clip (30) comprises at least two latching arms (32) embracing the body part (10) and/or 15 the mounting part (21) of the contact clip (20).
12. The cannula (1) according to any one of the preceding claims, characterized in that 20 the connection for introducing the liquid is attached coaxially on the body part to the cannula tube.
13. The cannula (1) according to any one of the preceding claims, 25 characterized in that the connection is formed with an injection tube (19) inserted in the body part (10).
14. The cannula (1) according to any one of the preceding 30 claims, PAJ130 characterized in that the mounting body (31) surrounds the at least one control element (35, 36), and in that the at least one control element (35, 36) is operable from the side facing away from the body 5 part (11).
15. The cannula (1) according to any one of the preceding claims, characterized in that 10 the mounting body is deformable on the side facing away from the body part (10) for operating the control element (35, 36) and/or in that the mounting body (31) on the side facing away from the body part (10) for operating the control element (35, 36) is made of a second electrically insulating plastic which is easily 15 deformable, preferably silicone.
16. The cannula (1) according to any one of the preceding claims, characterized in that 20 upon operating the control element (35, 36) a haptic feedback is generated, in particular by a snap dome.
17. The cannula (1) according to any one of the preceding claims, 25 characterized in that the at least one control element (35, 36) comprises an electrically capacitive switch and/or an electrically inductive switch. PAJ130
18. The cannula (1) according to any one of the preceding claims, characterized in that the body part (10) and/or the mounting part (21) of the contact 5 clip (20) and/or the mounting body (31) of the control clip (30) are made of an electrically insulating plastic.
19. The cannula body of a cannula (1) according to any one of the preceding claims.
20. The control clip (30) of a cannula (1) according to at least one of claims 1 to 18.
21. The contact clip (20) of a cannula (1) according to at 15 least one of claims 2 to 18. PAJ130
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018121733.1 | 2018-09-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ755981A true NZ755981A (en) |
Family
ID=
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